An Interesting Hybrid
The fruit here shown is a cross between the yellow-golden Queen raspberry and the Lawton blackberry. It possesses qualities of both blackberry and raspberry. When blackberry-raspberry hybrids are picked, it is not unusual for them to bring away the receptacle with the fruit, like a blackberry, if they are not quite ripe; and to leave the receptacle like a raspberry, if entirely ripe. Few of Mr. Burbank's experiments have greater scientific interest than those in which the raspberry and the blackberry have been hybridized.
This image is from: Luther Burbank: his methods and discoveries and their practical application. Volume 6 Chapter 2